Jstor.org JSTOR
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jstor.org Mobile Performance
22/100
These metrics represent real-world Chrome users experience viewing jstor.org on mobile devices. Reports are focused on loading performance and other critical factors that most affect user experience. Follow our guide to track, optimize, and improve the quality of your web pages.
User Loading Experience
First Input Delay
First Contentful Paint
Cumulative Layout Shift
Largest Contentful Paint
Metrics
Largest Contentful Paint0/100 11.0 s
Largest Contentful Paint marks the time at which the largest text or image is painted. Learn More
Total Blocking Time8/100 1,360 ms
Sum of all time periods between FCP and Time to Interactive, when task length exceeded 50ms, expressed in milliseconds. Learn more.
Time to Interactive21/100 11.1 s
Time to interactive is the amount of time it takes for the page to become fully interactive. Learn more.
Speed Index34/100 6.9 s
Speed Index shows how quickly the contents of a page are visibly populated. Learn more.
First Contentful Paint47/100 4.1 s
First Contentful Paint marks the time at which the first text or image is painted. Learn more.
Cumulative Layout Shift100/100 0
Cumulative Layout Shift measures the movement of visible elements within the viewport. Learn more.
Should Fix (19)
Opportunities
These suggestions can help your page load faster. They don't directly affect the Performance score.
Serve images in next-gen formats
Potential savings of 432 KiB
1,800 ms
Eliminate render-blocking resources
Potential savings of 1,590 ms
1,590 ms
Remove unused JavaScript
Potential savings of 185 KiB
1,350 ms
Efficiently encode images
Potential savings of 329 KiB
1,350 ms
Avoid multiple page redirects
Potential savings of 1,260 ms
1,260 ms
Properly size images
Potential savings of 213 KiB
600 ms
Preload key requests
Potential savings of 330 ms
330 ms
Remove unused CSS
Potential savings of 41 KiB
150 ms
Diagnostics
More information about the performance of your application. These numbers don't directly affect the Performance score.
Avoid `document.write()`
Ensure text remains visible during webfont load
Reduce the impact of third-party code
Third-party code blocked the main thread for 1,170 ms
Does not use passive listeners to improve scrolling performance
Minimize main-thread work
6.5 s
Reduce JavaScript execution time
3.4 s
Serve static assets with an efficient cache policy
11 resources found
Keep request counts low and transfer sizes small
52 requests • 1,279 KiB
Avoid chaining critical requests
12 chains found
Largest Contentful Paint element
1 element found
Avoid long main-thread tasks
17 long tasks found
Passed Audits (9)
Defer offscreen images
Use video formats for animated content
Enable text compression
Potential savings of 5 KiB
Minify CSS
Avoids an excessive DOM size
274 elements
Preconnect to required origins
Initial server response time was short
Root document took 380 ms
Minify JavaScript
Potential savings of 7 KiB
Avoids enormous network payloads
Total size was 1,279 KiB
jstor.org Mobile SEO
92/100
These checks ensure that your page is optimized for search engine results ranking. There are additional factors Lighthouse does not check that may affect your search ranking. Learn more. Run these additional validators on your site to check additional SEO best practices.
Should Fix (1)
Crawling and Indexing
To appear in search results, crawlers need access to your app.
Links are not crawlable
Passed Audits (12)
Document uses legible font sizes
99.71% legible text
Page isn’t blocked from indexing
Page has successful HTTP status code
Document avoids plugins
Links have descriptive text
Document has a meta description
Tap targets are sized appropriately
100% appropriately sized tap targets
Has a `<meta name="viewport">` tag with `width` or `initial-scale`
Document has a valid `hreflang`
Document has a `<title>` element
Image elements have `[alt]` attributes
robots.txt is valid
jstor.org Mobile Best Practices
77/100
These checks highlight opportunities to improve the overall code health of jstor.org mobile page. Current recommendations will help to make your page fast and secure, to create a good user experience and to avoid deprecated technologies.
Should Fix (3)
Trust and Safety
Includes front-end JavaScript libraries with known security vulnerabilities
3 vulnerabilities detected
Links to cross-origin destinations are unsafe
Does not use HTTPS
2 insecure requests found
Passed Audits (11)
Properly defines charset
Avoids deprecated APIs
Displays images with correct aspect ratio
Allows users to paste into password fields
Avoids requesting the geolocation permission on page load
Detected JavaScript libraries
Avoids Application Cache
Page has the HTML doctype
Avoids requesting the notification permission on page load
No browser errors logged to the console
Serves images with appropriate resolution
jstor.org Mobile Progressive Web App
21/100
These checks validate the aspects of a Progressive Web App. Learn more. These checks are required by the baseline PWA Checklist but are not automatically checked by Lighthouse. They do not affect your score but it's important that you verify them manually.
Should Fix (10)
PWA Optimized
Manifest doesn't have a maskable icon
Does not set a theme color for the address bar.
Is not configured for a custom splash screen
Content is not sized correctly for the viewport
Fast and reliable
`start_url` does not respond with a 200 when offline
Current page does not respond with a 200 when offline
Page load is not fast enough on mobile networks
Interactive at 11.1 s
Installable
Does not use HTTPS
2 insecure requests found
Web app manifest does not meet the installability requirements
Does not register a service worker that controls page and `start_url`
Passed Audits (4)
Has a `<meta name="viewport">` tag with `width` or `initial-scale`
Provides a valid `apple-touch-icon`
Contains some content when JavaScript is not available
Redirects HTTP traffic to HTTPS
jstor.org Mobile Accessibility
98/100
These checks highlight opportunities to improve the accessibility of your web app. Only a subset of accessibility issues can be automatically detected so manual testing is also encouraged. These items address areas which an automated testing tool cannot cover. Learn more in our guide on conducting an accessibility review.
Should Fix (1)
ARIA
These are opportunities to improve the usage of ARIA in your application which may enhance the experience for users of assistive technology, like a screen reader.
`[aria-hidden="true"]` elements contain focusable descendents
Passed Audits (23)
`[aria-hidden="true"]` is not present on the document `<body>`
`[id]` attributes on active, focusable elements are unique
The page contains a heading, skip link, or landmark region
Buttons have an accessible name
ARIA IDs are unique
`[user-scalable="no"]` is not used in the `<meta name="viewport">` element and the `[maximum-scale]` attribute is not less than 5.
`[aria-*]` attributes match their roles
Links have a discernible name
Lists contain only `<li>` elements and script supporting elements (`<script>` and `<template>`).
`<html>` element has a `[lang]` attribute
Document has a `<title>` element
Heading elements appear in a sequentially-descending order
List items (`<li>`) are contained within `<ul>` or `<ol>` parent elements
`[role]` values are valid
`[aria-*]` attributes are valid and not misspelled
Elements with an ARIA `[role]` that require children to contain a specific `[role]` have all required children.
Image elements have `[alt]` attributes
`[role]`s have all required `[aria-*]` attributes
Background and foreground colors have a sufficient contrast ratio
Form elements have associated labels
`[aria-*]` attributes have valid values
`[role]`s are contained by their required parent element
`<html>` element has a valid value for its `[lang]` attribute
Mobile Usability
95/100
These checks validate how easily a visitor can use jstor.org on a mobile device. Test results include a list of any mobile usability problems. Mobile usability problems are issues that can affect a user that visits the page on a mobile (small screen) device, including small font sizes (which are hard to read on a small screen).
Should Fix (2)
Avoid plugins
Size tap targets appropriately
Passed Audits (3)
Configure the viewport
Size content to viewport
Use legible font sizes
Mobile Speed
56/100
These checks analyze the performance of jstor.org on mobile devices and return PageSpeed score and information on how to improve the load time. What makes a good Progressive Web App?
Should Fix (4)
Eliminate render-blocking JavaScript and CSS in above-the-fold content
Leverage browser caching
Optimize images
Reduce server response time
Passed Audits (6)
Avoid landing page redirects
Enable compression
Minify CSS
Minify HTML
Minify JavaScript
Prioritize visible content
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